THE BEARING CAPACITY ANALYSIS ABOUT LARGE BORED PILES INLAID IN ROCKS OF A TALL BUILDING

Large bored piles inlaid in rocks have been more used in tall buildings. How to determine axial bearing capacity of single pile, according to data of pile load test researched the ultimate load, is a very actual problem. By analyzing the load-settlement curves of two large bored piles inlaid in soft rocks, making use of the inverse slope method and derivative graph method, we predicted the bearing capacities of these two piles. When it was compared with the calculating result using the formula of Chinese JGJ4-80 Standard, they accorded well.At last, this paper simply discussed the bearing mechanism of this kind of piles, and the distributing proportion of pile surface resistance to pile tip resistance. As for pile surface and tip resistance, we think that diffrent safety factors should be adopted.